Method of pretensioning and reinforcing a concrete casting
Abstract
Abstract A HOLLOW REINFORCING FORM WITH PROJECTIONS ON ITS EXTERIOR SURFACE, IS FILLED WITH CEMENT UNDER PRESSURE BUT WHEN THE CEMENT SETS IT WILL CONTRACT AND PERMIT THE HOLLOW METAL REINFORCING FORM TO RETURN TO NORMAL POSITION. THE REINFORCING FORM IS THEN HEATED TO ABOUT 150*F. AND PLACED IN A MOLD. THE METAL FORM WILL EXPAND TO A GREATER EXTENT THAN THE CEMENT WITHIN IT DUE TO THE HEATING. CONCRETE IS POURED AROUND THE REINFORCING FORM AND FILLS THE MOLD SO AS TO EMBED THE REINFORCING FORM. IF NECESSARY THE MOLD CAN BE VIBRATED FOR CAUSING ALL VOIDS IN THE MOLD TO BE FILLED WITH CONCRETE. WHEN THE CONCRETE SETS, THE REINFORCED CONCRETE CASTING IS REMOVED FROM THE MOLD AND THE HOLLOW REINFORCING MATERIAL WITH THE CEMENT THEREWITHIN WILL RETURN TO AMBIENT TEMPERATURE. THE HOLLOW REINFORCING MATERIAL WILL TEND TO CONTRACT TO A GREATER EXTENT THAN THE CEMENT WITHIN IT. THE CONTRACTING FORM THROUGH ITS PROJECTIONS WILL TEND TO COMPRESS THE CONCRETE AND WILL THUS PRETENSION THE CONCRETE CASTING. THE CEMENT IN THE HOLLOW REINFORCING MATERIAL WILL ADD GREATER STRENGTH TO THE FORM AND MATERIAL.
Inventors
- 👤 Earl P Embree
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |